Quantum Fluctuations of Charge Order Induce Phonon Softening in a 
Superconducting Cuprate

Huang, H. Y.; Singh, A.; Mou, C. Y.; Johnston, S.; Kemper, A. F.; van den Brink, J.; Chen, P. J.; Lee, T. K.; Okamoto, J.; Chu, Y. Y.; Li, J. H.; Komiya, S.; Komarek, A. C.; Fujimori, A.; Chen, C. T.; Huang, D. J.

doi:10.1103/PhysRevX.11.041038

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Quantum Fluctuations of Charge Order Induce Phonon Softening in a Superconducting Cuprate

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Komarek, A. C.
Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Huang, H. Y., Singh, A., Mou, C. Y., Johnston, S., Kemper, A. F., van den Brink, J., et al. (2021). Quantum Fluctuations of Charge Order Induce Phonon Softening in a Superconducting Cuprate. Physical Review X, 11(4): 041038, pp. 1-9. doi:10.1103/PhysRevX.11.041038.

Cite as: https://hdl.handle.net/21.11116/0000-0009-B2F0-E

Abstract

Quantum phase transitions play an important role in shaping the phase diagram of high-temperature cuprate superconductors. These cuprates possess intertwined orders which interact strongly with superconductivity. However, the evidence for the quantum critical point associated with the charge order in the superconducting phase remains elusive. Here, we reveal the short-range charge orders and the spectral signature of the quantum fluctuations in La2-xSrxCuO4 (LSCO) near the optimal doping using highresolution resonant inelastic x-ray scattering. On performing calculations through a diagrammatic framework, we discover that the charge correlations significantly soften several branches of phonons. These results elucidate the role of charge order in the LSCO compound, providing evidence for quantum critical scaling and discommensurations associated with charge order.